phil armitage, stony brook

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General astronomy Black holes Exoplanets Extraterrestrial Life Astrophysics 1 Astrophysics 2 Internal processes 1 Stellar structure & evolution Solar system dynamics & origins Radiative & dynamical processes
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WELCOME to the web site of Phil Armitage at Stony Brook University. I'm interested in using numerical simulations to understand the physics of protoplanetary disks, the formation of extrasolar planets, and the astrophysics of black holes. Topics of recent interest incude the formation of planetesimals, the accretion of planetary envelopes, and the use of machine learning for theoretical studies of planetary dynamics. I currently divide my time between Stony Brook, working with Sabina Sagynbayeva, and the Center for Computational Astrophysics at the Flatiron Institute, where I lead the planet formation group. Collaborations include the EU-funded DUSTBUSTERS network, studying dust and gas in protoplanetary disks, which Stony Brook is part of.


Simulation of accretion disk turbulence, by Jake Simon
Recent papers
Revisiting collisional dust growth in Class 0/I protostellar disks: Sweep-up can convert a few x 10 Earth masses of dust into kg pebbles in 0.1 Myr, W. Xu & P.J. Armitage, ApJ, in press

The role of the drag force in the gravitational stability of dusty planet forming disc - I. Analytical theory, C. Longarini, G. Lodato, G. Bertin & P.J. Armitage, MNRAS, in press

Saturation of the magnetorotational instability and the origin of magnetically elevated accretion discs, M.C. Begelman & P.J. Armitage, MNRAS, submitted

A neural network subgrid model of the early stages of planet formation, T. Pfeil, M. Cranmer, S. Ho, P.J. Armitage, T. Birnstiel & H. Klahr, NeurIPS 2022, accepted

Particle clustering in turbulence: Prediction of spatial and statistical properties with deep learning, Y.-M. Chan, N. Manger, Y. Li, C.-C. Yang, Z. Zhu, P.J. Armitage & S. Ho, ApJ, submitted

Lifetime of the outer Solar System Nebula from carbonaceous chondrites, C.S. Borlina, B.P. Weiss, J.F.J. Bryson & P.J. Armitage, Journal of Geophysical Research: Planets, 127, article id. e07139 (2022)

Instability from high-order resonant chains in wide-separation massive planet systems, M. Murphy & P.J. Armitage, MNRAS, 512, 2750 (2022)

MHD disc winds can reproduce fast disc dispersal and the correlation between accretion rate and disc mass in Lupus, B. Tabone, G.P. Rosotti, G. Lodato, P.J. Armitage, A.J. Cridland & E.F. van Dishoeck, MNRAS Letters, 512, L74 (2022)

Secular evolution of MHD wind-driven discs: analytical solutions in the expanded alpha-framework, B. Tabone, G.P. Rosotti, A.J. Cridland, P.J. Armitage & G. Lodato, MNRAS, 512, 2290 (2022)

Reviews and notes
Demographics of young stars and their protoplanetary disks (C.F. Manara et al., review for Protostars and Planets VII)

Lecture notes on accretion disk physics (arXiv only)

Visualizing the kinematics of planet formation, Disk Dynamics Collaboration

Physical processes in protoplanetary disks (Armitage, 45th Saas-Fee Advanced Course "From Protoplanetary Disks to Planet Formation")

A brief overview of planet formation (Armitage, short introduction for the Handbook of Exoplanets)

Dynamics of protoplanetary disks (Armitage, ARA&A, 2011)

Lecture notes on the formation and early evolution of planetary systems (arXiv only)

Textbook

Personal I did my undergraduate and graduate work at the University of Cambridge, working with Cathie Clarke at the Institute of Astronomy as my primary advisor. I was a postdoc at CITA and MPA, a lecturer at St Andrews, and a professor at the University of Colorado (2002-2018) before moving to New York.

Beyond work I enjoy hiking, often combined with photography. My main focus is landscapes, but over the years I've also made trips to photograph bears in some spectacular spots in Alaska.

Philip Armitage
email: philip.armitage@stonybrook.edu